Williams, Sauber and Marussia have confirmed their plans for the Mugello test next week, taking different approaches to their respective driver line-ups.

Williams is splitting its running equally between three drivers, with third driver Valtteri Bottas in the car on the opening day. Bottas has already taken part in three of the 15 Friday practice sessions that he's scheduled to do this season, and also ran for a day at the second pre-season test in Barcelona. Bruno Senna will then run on Wednesday and Pastor Maldonado is set to drive the FW34 on the final day.

Sauber has decided not to run test driver Esteban Gutierrez, however, and has remained with its race drivers for the whole test. Kamui Kobayashi will get the majority of the running as he is in the car on Tuesday and Wednesday before Sergio Perez takes over on Thursday.

Marussia also confirmed to ESPNF1 that it will split the running equally between its two race drivers, with Charles Pic driving on Tuesday and Wednesday morning before Timo Glock takes over for the afternoon and Thursday.

Only Red Bull, Toro Rosso and Mercedes are yet to formally announce their driver line-ups, with Red Bull telling ESPNF1 that it is still to finalise its schedule. Daniel Ricciardo also revealed on Twitter that he is lined up to drive on Wednesday afternoon and Thursday for Toro Rosso.